Re-estimation of Nuclear Data and JEFF 3.1.1 Uncertainty Calculations

Conference · Sun Jan 01 04:00:00 EST 2012

OSTI ID:1039626

Santamarina, A. ^[1]; Bernard, D. ^[1]; Dos Santos, N. ^[1]; Leray, O. ^[1]; Vaglio, C. ^[1]; Leal, Luiz C ^[2]

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1. Commissariat a l'Energie Atomique et aux Energies Alternatives
2. ORNL

This paper describes the method to define relevant targeted integral measurements that allow the improvement of nuclear data evaluations and the determination of corresponding reliable covariances. {sup 235}U and {sup 56}Fe examples are pointed out for the improvement of JEFF3 data. Utilizations of these covariances are shown for Sensitivity and Representativity studies, Uncertainty calculations, and Transposition of experimental results to industrial applications. S/U studies are more and more used in Reactor Physics and Safety-Criticality. However, the reliability of study results relies strongly on the ND covariance relevancy. Our method derives the real uncertainty associated with each evaluation from calibration on targeted integral measurements. These realistic covariance matrices allow reliable JEFF3.1.1 calculation of prior uncertainty due to nuclear data, as well as uncertainty reduction based on representative integral experiments, in challenging design calculations such as GEN3 and RJH reactors.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1039626
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
CALIBRATION
DESIGN
EVALUATION
JULES HOROWITZ REACTOR
MATRICES
REACTOR PHYSICS
RELIABILITY
SENSITIVITY